Which of the following is a common method of non-destructive testing used in aircraft maintenance?

Ultrasonic testing is a common non-destructive testing (NDT) method utilized in aircraft maintenance to detect internal flaws or measurements within materials without causing damage. It employs high-frequency sound waves that are introduced into the material being inspected. When these sound waves encounter a flaw or change within the material, they are reflected back to a receiver, allowing inspectors to assess the integrity of the structure.

This method is particularly valuable in aviation due to its ability to provide detailed information about the thickness of structural components and to identify potential defects such as cracks, porosities, or inclusions that may not be visible from the surface. Because ultrasonic testing is precise and can be used on a variety of materials—such as metals, plastics, and composite materials—it plays a vital role in ensuring the safety and reliability of aircraft.

While other non-destructive testing methods like X-ray and magnetic testing are also essential within the field, ultrasonic testing stands out for its detailed analysis capabilities and versatility. Visual observation is critical for initial assessments and routine inspections, but it does not provide the depth of insight into internal structures that ultrasonic testing delivers.